[PATCH] D89402: clang/Lex: Stop using SourceManager::getBuffer

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith created this revision.
dexonsmith added a reviewer: arphaman.
Herald added a subscriber: ributzka.
dexonsmith requested review of this revision.

Update clang/lib/Lex to stop relying on a `MemoryBuffer*`, using the
`MemoryBufferRef` from `getBufferOrNone` since both locations had logic
for checking validity of the buffer. There's potentially a functionality
change, since the logic was wrong (it checked for `nullptr`, which was
never returned by the old API), but if that was reachable the new
behaviour should be better.


https://reviews.llvm.org/D89402

Files:
  clang/lib/Lex/ModuleMap.cpp
  clang/lib/Lex/PPDirectives.cpp


Index: clang/lib/Lex/PPDirectives.cpp
===================================================================
--- clang/lib/Lex/PPDirectives.cpp
+++ clang/lib/Lex/PPDirectives.cpp
@@ -379,7 +379,8 @@
 
   std::pair<FileID, unsigned> HashFileOffset =
       SourceMgr.getDecomposedLoc(HashLoc);
-  const llvm::MemoryBuffer *Buf = SourceMgr.getBuffer(HashFileOffset.first);
+  Optional<llvm::MemoryBufferRef> Buf =
+      SourceMgr.getBufferOrNone(HashFileOffset.first);
   if (!Buf)
     return None;
   auto It =
Index: clang/lib/Lex/ModuleMap.cpp
===================================================================
--- clang/lib/Lex/ModuleMap.cpp
+++ clang/lib/Lex/ModuleMap.cpp
@@ -3004,7 +3004,7 @@
   }
 
   assert(Target && "Missing target information");
-  const llvm::MemoryBuffer *Buffer = SourceMgr.getBuffer(ID);
+  llvm::Optional<llvm::MemoryBufferRef> Buffer = SourceMgr.getBufferOrNone(ID);
   if (!Buffer)
     return ParsedModuleMap[File] = true;
   assert((!Offset || *Offset <= Buffer->getBufferSize()) &&


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